More than likely, your image size it too large. To make it smaller, follow these steps:

Open Paint
Open Your Picture in Paint
Click "Image"
Click "Resize/Skew"
Resize the image by entering a number in the % boxes. Both numbers should be identical. For avatars, i usually resize my pictures to 8 or 10%
Save As Whatever you want

Then try to upload.

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Ryan- The Cruise Encyclopedia

Oasis of the Seas
Allure of the Seas
Freedom of the Seas
Mariner of the Seas
Navigator of the Seas
Grandeur of the Seas
Enchantment of the Seas
Brilliance of the Seas
Jewel of the Seas
Monarch of the Seas
Voyager of the Seas
Sovereign of the Seas
Fantasy
Sensation
Fascination
Carnival Glory
Carnival Valor
Carnival Conquest
Cunard Queen Mary 2
Disney Magic/Wonder
Cruise Total as of July 2014: 118 Cruises